I've been chasing this around for the entire afternoon and decided it's time for a post and some help.  Can I use the DNNProfileProvider with other (non-DNN, but ASP.Net 2.0) sites?  I have several DNN portals on one DNN (4.5.5) install and am pointing them to a dashCommerce storefront.  The Membership integration works seemlessly simply by making the correct web.config entries.  I'm assuming I just don't have the correct config yet to get this to fly. 

Here's what I have in the web.config for the dashCommerce site:

      <profile
            enabled="true"
            defaultProvider="DNNProfileProvider">
        <providers>
          <clear />
          <add
            name="DNNProfileProvider"
            type="DotNetNuke.Security.Profile.DNNProfileProvider, DotNetNuke.Provider.DNNProvider"
            connectionStringName="MembershipSqlServer"
            applicationName="DotNetNuke" />
      </providers>

I've copied the DotNetNuke.*.dll assemblies to the ../bin/...of the dashCommerce site and I receive this error when attempting to view any page after authenticating on a DNN portal:

Parser Error Message: Provider must implement the class 'System.Web.Profile.ProfileProvider'.

Source Error:
Line 278:          <add
Line 279:            name="DNNProfileProvider"
Line 280:            type="DotNetNuke.Security.Profile.DNNProfileProvider, DotNetNuke.Provider.DNNProvider"
Line 281:            connectionStringName="MembershipSqlServer"
Line 282:            applicationName="DotNetNuke" />

 Any help is greatly appreciated.  Thanks,

-Paul